过渡金属二硫族化合物ReS $_2$光激发在有机半导体四苯中产生三重态
Generating Triplets in Organic Semiconductor Tetracene upon Photoexcitation of Transition Metal Dichalcogenide ReS$_2$
摘要：
我们研究了二维过渡金属二硫属化物ReS $_2$和并四苯的双层膜中光激发电子态的转移动力学，目的是在后者中产生三重态。使用该材料组合是因为ReS $_2$的带隙（1.5 eV）略大于并四苯的三重态能量（1.25 eV）。利用时间分辨光吸收光谱，从ReS $_2$的三重态的光激发态的转移被发现发生在5 ps的效率接近38%。这一结果开辟了新的可能性异质结构设计的二维材料与合适的有机物产生长寿命的三重态。三重态作为敏化剂在包括光电子学、光电子学、光子学和光子上转换的各种应用中是令人感兴趣的。
英文摘要：
We studied the dynamics of transfer of photoexcited electronic states in a bilayer of the two-dimensional transition metal dichalcogenide ReS$_2$ and tetracene, with the aim to produce triplets in the latter. This material combination was used as the band gap of ReS$_2$ (1.5 eV) is slightly larger than the triplet energy of tetracene (1.25 eV). Using time-resolved optical absorption spectroscopy, transfer of photoexcited states from ReS$_2$ to triplet states in tetracene was found to occur within 5 ps with an efficiency near 38%. This result opens up new possibilities for heterostructure design of two-dimensional materials with suitable organics to produce long-lived triplets. Triplets are of interest as sensitizers in a wide variety of applications including optoelectronics, photovoltaics, photocatalysis, and photon upconversion.
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